return user's terminal name
tty utility writes the name of the
terminal attached to standard input to standard output. The name that is
written is the string returned by
If the standard input is not a terminal, the message “not a tty” is written.
The options are as follows:
- Don't write the terminal name; only the exit status is affected when this
option is specified. The
-soption is deprecated in favor of the “
test -t 0” command.
tty utility exits 0 if the standard
input is a terminal, 1 if the standard input is not a terminal, or >1 if
an error occurred.
stty(1), test(1), ttyname(3), tty(4)
tty utility is compliant with the
IEEE Std 1003.1-2008 (“POSIX.1”)
tty command appeared in
Version 1 AT&T UNIX.